Casper l



UNITED STATES PATENT OFFICE.

CASPER L. REDFIELD, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE CHICAGO MATRIX-MACHINE COMPANY.

PROCESS OF FORMING MATRICES.

SPECIFICATION forming part of Letters Patent No. 429,867, dated J une 10, 1890. Application filed March 26, 1890. Serial No. 345,378. (No model.)

To a/ZZ whom, it may concern: In such drawings, l designates a type-die Be it known that I, CASPER L. REDFIELD, (shown in longitudinal section) having a fora citizen of the United States, residing at Chiward branch 2 anda rearwardbranch 3, which cago, in the county of Cook and State of Illimay represent the two stems of a letter, as 55 5 nois, have invented certain new and useful an 0. (Shown in transverse section.) The Improvements in the Process of Forming` lower portions of these two branches 2 and Matrices, of which the following is a speciii- 3 have their sides parallel, and these are abutcation. ted by shoulders 4, from which the walls 5 My invention relates to the art of producmay incline outward to the body of the die- 6o 1o ing matrices from which to cast plates for head. The matrix material 6, composed of printing, and particularly to the formation of any suitable impressible subst-ance, is supsuch matrices by the successive impressions ported on an un'yielding base or anvil while of type-dies into a yielding matrix material. receiving die-impressions, and a distortion of The object of the invention is the correcits lower surface being thus precluded mate- 65 i5 tion of the distortions produced in the several rial is crowded laterally from the face and impressions by the next succeeding impressides of the die, as indicated by arrows in the sions, so that when the matrix is completed drawings. The inclined and shouldered pora stereotype-plate can be cast therefrom that tions of the die produce a widened opening will be capable of producing good print. In toward the surface of the matrix-body, and 7o 2o formingthe successivecharacter-impresssions the walls of the impression will not be suffieach die nnavoidably crowds laterally more ciently distortedby the succeeding impression or less of the matrix material, and the mateto bring them in vertical line with the marrial so displaced forces inward the adjacent gins of the character-face. The inclination walls of the last preceding impression, and of the face of theimpression will be affected 75 2 5 also to a greater or less extent raises the forby the spreading of the material by the die ward portions of the face (bottom) of the imin making the next impression, and the forpression, so that if the walls were normally ward portion of the face is thus caused to vertical and the face on a horizontal plane rise to the right position to be in horizontal the forward wall would be crowded inward line with other portions of the same face and 8o 3o and the face inclined. To obviate this obv wvith the preceding faces. Any other suitjectionable distortion, I widen the impression able form of type or die may be used that above the face andincline the face downward will serve to widen the impressions sufficiently toward the forward side, so that the formato permit easy casting and serve also to intion of a later impression will correct wholly eline the character-face suitably to allow the S5 3 5 or partially the face inclination of the earlier next impression to raise it to the desired plane. impressions and raise it to the horizontal The degree of the face inclinations must of plane. course be proportioned to the extent of the In carrying out my process I prefer to use Vertical displacement of matrix material protype-dies of the character disclosed in my apduced by the successive impressions, in order 9o 4o plication, Serial No. 345,377,iled concurrently that upon completion of the matrix the charherewith, in which the dies are shown as havacter-faees will be approximately on a horiing shoulders surrounding the characterzontal plane. A stereotype-plate cast from faces and the faces themselves are inclined such matrix, should the faces present any undownwardtowardthe forward side. Anysuitevenness, can be dressed off slightly to pro- 95 45 able mechanism may be employed to present duce absolutely level type-faces, from which and impress the dies to form the matrix. perfect print may be made.

In the drawings forming a part of this ap- Having described my invention, what I plication,Figure l shows a die impressed into claim isa matrix material; Fig. 2, a second impression l. The process of forming matrices for stererco 5o of the die adjacent to the first, and Fig. 3 a otype-plates, which consists inimpressing dies third impression adjacent to the second. in sequence into a matrix-body to a greater depth at the forward portion of the face than elsewhere, substantially as set forth.

2. The process of forming matrices for stereotype-plates, which consists in forming the impressions successively by dies and compressingl the matrix material laterally at both sides of the path of the type-faces to Widen the impression and inclining the face downward to- Ward the front, substantially as set forth.

3. The process of forming matrices for stereotype-plates, which consists in forming successive impressions having sloping faces and correcting, such irregularity in one impression by the making of the next, substantially as set forth.

4. The process of forming matrices for stereotype-plates, which consists in forming the im- 

